A volumetric model to estimate the amount of gas in a newly discovered rock reservoir.

Abstract

A volumetric calculation of the amount of gas in a rock reservoir requires in practice numerical integration of a volume integral. The distributions of porosity- and gassaturation values throughout the reservoir have then to be known: Since in all practical cases these distributions are only partially known, the calculatiorì of the amount of gas in the reservoir can only be made using a model of the reservoir from which the overall distributions are derived. The model is based on premises that have to be specified separately. The problem of finding suitable distributions is most urgent for a newly discovered reservoir. Therefore an example of such a case has been picked out and general geological and physical considerations have been used as the principal premises in order to arrive at a starting model, named the Continuous Conformal Model (CCM). The construction and computational procedures are illustrated by a numerical example.